![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/plugins/backend/collectd/unixsock.c b/src/plugins/backend/collectd/unixsock.c
--- /dev/null
@@ -0,0 +1,429 @@
+/*
+ * SysDB - src/plugins/backend/collectd/unixsock.c
+ * Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include "sysdb.h"
+#include "core/plugin.h"
+#include "core/store.h"
+#include "utils/error.h"
+#include "utils/unixsock.h"
+
+#include "liboconfig/utils.h"
+
+#include <assert.h>
+
+#include <errno.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+SDB_PLUGIN_MAGIC;
+
+/*
+ * private data types
+ */
+
+typedef struct {
+ char *current_host;
+ sdb_time_t current_timestamp;
+ int metrics_updated;
+ int metrics_failed;
+} sdb_collectd_state_t;
+#define SDB_COLLECTD_STATE_INIT { NULL, 0, 0, 0 }
+
+/*
+ * private helper functions
+ */
+
+/* store the specified host-name (once per iteration) */
+static int
+sdb_collectd_store_host(sdb_collectd_state_t *state,
+ const char *hostname, sdb_time_t last_update)
+{
+ int status;
+
+ if (last_update > state->current_timestamp)
+ state->current_timestamp = last_update;
+
+ if (state->current_host && (! strcasecmp(state->current_host, hostname)))
+ return 0;
+ /* else: first/new host */
+
+ if (state->current_host) {
+ sdb_log(SDB_LOG_DEBUG, "collectd::unixsock backend: Added/updated "
+ "%i metric%s (%i failed) for host '%s'.",
+ state->metrics_updated, state->metrics_updated == 1 ? "" : "s",
+ state->metrics_failed, state->current_host);
+ state->metrics_updated = state->metrics_failed = 0;
+ free(state->current_host);
+ }
+
+ state->current_host = strdup(hostname);
+ if (! state->current_host) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to allocate "
+ "string buffer: %s",
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ return -1;
+ }
+
+ status = sdb_store_host(hostname, last_update);
+
+ if (status < 0) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to "
+ "store/update host '%s'.", hostname);
+ return -1;
+ }
+ else if (status > 0) /* value too old */
+ return 0;
+
+ sdb_log(SDB_LOG_DEBUG, "collectd::unixsock backend: Added/updated "
+ "host '%s' (last update timestamp = %"PRIsdbTIME").",
+ hostname, last_update);
+ return 0;
+} /* sdb_collectd_store_host */
+
+static int
+sdb_collectd_add_metrics(const char *hostname, char *plugin, char *type,
+ sdb_time_t last_update)
+{
+ char name[strlen(plugin) + strlen(type) + 2];
+ char *plugin_instance, *type_instance;
+
+ sdb_data_t data = { SDB_TYPE_STRING, { .string = NULL } };
+
+ int status;
+
+ snprintf(name, sizeof(name), "%s/%s", plugin, type);
+
+ status = sdb_store_metric(hostname, name, NULL, last_update);
+ if (status < 0) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to "
+ "store/update metric '%s/%s'.", hostname, name);
+ return -1;
+ }
+
+ plugin_instance = strchr(plugin, '-');
+ if (plugin_instance) {
+ *plugin_instance = '\0';
+ ++plugin_instance;
+
+ data.data.string = plugin_instance;
+ sdb_store_metric_attr(hostname, name,
+ "plugin_instance", &data, last_update);
+ }
+
+ type_instance = strchr(type, '-');
+ if (type_instance) {
+ *type_instance = '\0';
+ ++type_instance;
+
+ data.data.string = type_instance;
+ sdb_store_metric_attr(hostname, name,
+ "type_instance", &data, last_update);
+ }
+
+ data.data.string = plugin;
+ sdb_store_metric_attr(hostname, name, "plugin", &data, last_update);
+ data.data.string = type;
+ sdb_store_metric_attr(hostname, name, "type", &data, last_update);
+ return 0;
+} /* sdb_collectd_add_metrics */
+
+static int
+sdb_collectd_get_data(sdb_unixsock_client_t __attribute__((unused)) *client,
+ size_t n, sdb_data_t *data, sdb_object_t *user_data)
+{
+ sdb_collectd_state_t *state;
+ sdb_data_t last_update;
+
+ char *hostname;
+ char *plugin;
+ char *type;
+
+ assert(user_data);
+
+ /* 0: <last_update> <hostname>
+ * 1: <plugin>
+ * 2: <type> */
+ assert(n == 3);
+ assert((data[0].type == SDB_TYPE_STRING)
+ && (data[1].type == SDB_TYPE_STRING)
+ && (data[2].type == SDB_TYPE_STRING));
+
+ hostname = data[0].data.string;
+ plugin = data[1].data.string;
+ type = data[2].data.string;
+
+ hostname = strchr(hostname, ' ');
+ if (! hostname) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Expected to find "
+ "a space character in the LISTVAL response");
+ return -1;
+ }
+ *hostname = '\0';
+ ++hostname;
+
+ if (sdb_data_parse(data[0].data.string, SDB_TYPE_DATETIME, &last_update)) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to parse "
+ "timestamp '%s' returned by LISTVAL: %s", data[0].data.string,
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ return -1;
+ }
+
+ state = SDB_OBJ_WRAPPER(user_data)->data;
+ if (sdb_collectd_store_host(state, hostname, last_update.data.datetime))
+ return -1;
+
+ if (sdb_collectd_add_metrics(hostname, plugin, type,
+ last_update.data.datetime))
+ ++state->metrics_failed;
+ else
+ ++state->metrics_updated;
+ return 0;
+} /* sdb_collectd_get_data */
+
+/*
+ * plugin API
+ */
+
+static int
+sdb_collectd_init(sdb_object_t *user_data)
+{
+ sdb_unixsock_client_t *client;
+
+ if (! user_data)
+ return -1;
+
+ client = SDB_OBJ_WRAPPER(user_data)->data;
+ if (sdb_unixsock_client_connect(client)) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: "
+ "Failed to connect to collectd.");
+ return -1;
+ }
+
+ sdb_log(SDB_LOG_INFO, "collectd::unixsock backend: Successfully "
+ "connected to collectd @ %s.",
+ sdb_unixsock_client_path(client));
+ return 0;
+} /* sdb_collectd_init */
+
+static int
+sdb_collectd_shutdown(__attribute__((unused)) sdb_object_t *user_data)
+{
+ if (! user_data)
+ return -1;
+
+ sdb_unixsock_client_destroy(SDB_OBJ_WRAPPER(user_data)->data);
+ SDB_OBJ_WRAPPER(user_data)->data = NULL;
+ return 0;
+} /* sdb_collectd_shutdown */
+
+static int
+sdb_collectd_collect(sdb_object_t *user_data)
+{
+ sdb_unixsock_client_t *client;
+
+ char buffer[1024];
+ char *line;
+ char *msg;
+
+ char *endptr = NULL;
+ long int count;
+
+ sdb_collectd_state_t state = SDB_COLLECTD_STATE_INIT;
+ sdb_object_wrapper_t state_obj = SDB_OBJECT_WRAPPER_STATIC(&state);
+
+ if (! user_data)
+ return -1;
+
+ client = SDB_OBJ_WRAPPER(user_data)->data;
+
+ if (sdb_unixsock_client_send(client, "LISTVAL") <= 0) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to send "
+ "LISTVAL command to collectd @ %s.",
+ sdb_unixsock_client_path(client));
+ return -1;
+ }
+
+ line = sdb_unixsock_client_recv(client, buffer, sizeof(buffer));
+ if (! line) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to read "
+ "status of LISTVAL command from collectd @ %s.",
+ sdb_unixsock_client_path(client));
+ return -1;
+ }
+
+ msg = strchr(line, ' ');
+ if (msg) {
+ *msg = '\0';
+ ++msg;
+ }
+
+ errno = 0;
+ count = strtol(line, &endptr, /* base */ 0);
+ if (errno || (line == endptr)) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to parse "
+ "status of LISTVAL command from collectd @ %s.",
+ sdb_unixsock_client_path(client));
+ return -1;
+ }
+
+ if (count < 0) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to get "
+ "value list from collectd @ %s: %s",
+ sdb_unixsock_client_path(client),
+ msg ? msg : line);
+ return -1;
+ }
+
+ if (sdb_unixsock_client_process_lines(client, sdb_collectd_get_data,
+ SDB_OBJ(&state_obj), count, /* delim */ "/",
+ /* column count = */ 3,
+ SDB_TYPE_STRING, SDB_TYPE_STRING, SDB_TYPE_STRING)) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed "
+ "to read response from collectd @ %s.",
+ sdb_unixsock_client_path(client));
+ return -1;
+ }
+
+ if (state.current_host) {
+ sdb_log(SDB_LOG_DEBUG, "collectd::unixsock backend: Added/updated "
+ "%i metric%s (%i failed) for host '%s'.",
+ state.metrics_updated, state.metrics_updated == 1 ? "" : "s",
+ state.metrics_failed, state.current_host);
+ free(state.current_host);
+ }
+ return 0;
+} /* sdb_collectd_collect */
+
+static int
+sdb_collectd_config_instance(oconfig_item_t *ci)
+{
+ char *name = NULL;
+ char *socket_path = NULL;
+
+ sdb_object_t *user_data;
+ sdb_unixsock_client_t *client;
+
+ int i;
+
+ if (oconfig_get_string(ci, &name)) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Instance requires "
+ "a single string argument\n\tUsage: <Instance NAME>");
+ return -1;
+ }
+
+ for (i = 0; i < ci->children_num; ++i) {
+ oconfig_item_t *child = ci->children + i;
+
+ if (! strcasecmp(child->key, "Socket"))
+ oconfig_get_string(child, &socket_path);
+ else
+ sdb_log(SDB_LOG_WARNING, "collectd::unixsock backend: Ignoring "
+ "unknown config option '%s' inside <Instance %s>.",
+ child->key, name);
+ }
+
+ if (! socket_path) {
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Instance '%s' "
+ "missing the 'Socket' option.", name);
+ return -1;
+ }
+
+ client = sdb_unixsock_client_create(socket_path);
+ if (! client) {
+ char errbuf[1024];
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to create "
+ "unixsock client: %s",
+ sdb_strerror(errno, errbuf, sizeof(errbuf)));
+ return -1;
+ }
+
+ user_data = sdb_object_create_wrapper("unixsock-client", client,
+ (void (*)(void *))sdb_unixsock_client_destroy);
+ if (! user_data) {
+ sdb_unixsock_client_destroy(client);
+ sdb_log(SDB_LOG_ERR, "collectd::unixsock backend: Failed to allocate "
+ "sdb_object_t");
+ return -1;
+ }
+
+ sdb_plugin_register_init(name, sdb_collectd_init, user_data);
+ sdb_plugin_register_shutdown(name, sdb_collectd_shutdown, user_data);
+
+ sdb_plugin_register_collector(name, sdb_collectd_collect,
+ /* interval */ NULL, user_data);
+
+ /* pass control to the list */
+ sdb_object_deref(user_data);
+ return 0;
+} /* sdb_collectd_config_instance */
+
+static int
+sdb_collectd_config(oconfig_item_t *ci)
+{
+ int i;
+
+ if (! ci) /* nothing to do to deconfigure this plugin */
+ return 0;
+
+ for (i = 0; i < ci->children_num; ++i) {
+ oconfig_item_t *child = ci->children + i;
+
+ if (! strcasecmp(child->key, "Instance"))
+ sdb_collectd_config_instance(child);
+ else
+ sdb_log(SDB_LOG_WARNING, "collectd::unixsock backend: Ignoring "
+ "unknown config option '%s'.", child->key);
+ }
+ return 0;
+} /* sdb_collectd_config */
+
+int
+sdb_module_init(sdb_plugin_info_t *info)
+{
+ sdb_plugin_set_info(info, SDB_PLUGIN_INFO_DESC,
+ "backend accessing the system statistics collection daemon "
+ "throught the UNIXSOCK interface");
+ sdb_plugin_set_info(info, SDB_PLUGIN_INFO_COPYRIGHT,
+ "Copyright (C) 2012 Sebastian 'tokkee' Harl <sh@tokkee.org>");
+ sdb_plugin_set_info(info, SDB_PLUGIN_INFO_LICENSE, "BSD");
+ sdb_plugin_set_info(info, SDB_PLUGIN_INFO_VERSION, SDB_VERSION);
+ sdb_plugin_set_info(info, SDB_PLUGIN_INFO_PLUGIN_VERSION, SDB_VERSION);
+
+ sdb_plugin_register_config(sdb_collectd_config);
+ return 0;
+} /* sdb_version_extra */
+
+/* vim: set tw=78 sw=4 ts=4 noexpandtab : */
+